1-) Show that the inverse of an increasing function is increasing, and the inverse of a decreasing function is decreasing. 2-) Find the functions and g such that f+g is even and f-g is odd. 3-) f: R\{a} R\{b} and f(x) is one-to-one and onto. f(x): == 2x-11 3x-4 is given. What is the=? (2x+a if x 1 4-) f(x) = x-3 if x > 1 is given. Find the value of a, for the continuity of f(x) at x = 1. 5-) f(x) = x-4 is given. Sketch the graph of f(x).